/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hive.ql.exec.vector.expressions;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.typeinfo.CharTypeInfo;

public class CastCharToBinary extends StringUnaryUDFDirect {

  private static final long serialVersionUID = 1L;
  private int maxLength;

  public CastCharToBinary(int inputColumn, int outputColumnNum) {
    super(inputColumn, outputColumnNum);
  }

  public CastCharToBinary() {
    super();
  }

  @Override
  public void transientInit(Configuration conf) throws HiveException {
    super.transientInit(conf);

    maxLength = ((CharTypeInfo) inputTypeInfos[0]).getLength();
  }

  /**
   * Do pad out the CHAR type into the BINARY result, taking into account Unicode...
   */
  protected void func(BytesColumnVector outV, byte[][] vector, int[] start, int[] length, int i) {
    StringExpr.padRight(outV, i, vector[i], start[i], length[i], maxLength);
  }

  public String vectorExpressionParameters() {
    return getColumnParamString(0, inputColumnNum[0]) + ", maxLength " + maxLength;
  }
}
